Update Preference System (#56)

* Update NextUpdate

* Add PreferenceInputs and PreferenceOutputs

* Update PreferenceBridge implementation

* Update VersionSeed implementation

* Add HostPreferencesCombiner implementation

* Add PreferenceCombiner implementation

* Remove unnecessary @_transparent

* Add wrapInputs and wrapOutputs

* Update HostPreferenceKey call

* Fix Linux build issue

Author: Kyle-Ye

Sources/OpenSwiftUI/Core/Attribute/AsyncAttribute.swift

@@ -9,6 +9,10 @@ internal import OpenGraphShims
 
 protocol AsyncAttribute: _AttributeBody {}
 
+extension AsyncAttribute {
+    static var flags: OGAttributeTypeFlags { [] }
+}
+
 extension Attribute {
     func syncMainIfReferences<V>(do body: (Value) -> V) -> V {
         fatalError("TODO")

Sources/OpenSwiftUI/Core/Data/BloomFilter.swift

@@ -22,7 +22,6 @@ struct BloomFilter: Equatable {
         self.init(hashValue: Int(bitPattern: pointer))
     }
 
-    @_transparent
     @inline(__always)
     func match(_ filter: BloomFilter) -> Bool {
         (value & filter.value) == value

Sources/OpenSwiftUI/Core/Data/Property/PropertyList.swift

@@ -383,7 +383,6 @@ extension PropertyList {
 
 // MARK: - PropertyList.Tracker Helper functions
 
-@_transparent
 @inline(__always)
 private func match(data: TrackerData, plist: PropertyList) -> Bool {
     if let elements = plist.elements,
@@ -396,7 +395,6 @@ private func match(data: TrackerData, plist: PropertyList) -> Bool {
     }
 }
 
-@_transparent
 @inline(__always)
 private func match(data: TrackerData, from: PropertyList, to: PropertyList) -> UniqueID? {
     if let fromElement = from.elements,

Sources/OpenSwiftUI/Core/Data/VersionSeed.swift

@@ -8,30 +8,44 @@
 
 struct VersionSeed: CustomStringConvertible {
     var value: UInt32
-    
+
     var description: String {
         switch value {
-        case VersionSeed.zero.value: "empty"
+        case VersionSeed.empty.value: "empty"
         case VersionSeed.invalid.value: "invalid"
         default: value.description
         }
     }
-    
-    static var zero: VersionSeed { VersionSeed(value: .zero) }
+
+    @inline(__always)
+    static var empty: VersionSeed { VersionSeed(value: .zero) }
+
+    @inline(__always)
     static var invalid: VersionSeed { VersionSeed(value: .max) }
-    
-    var isValid: Bool { value != VersionSeed.invalid.value }
-    
-    @_transparent
+
+    @inline(__always)
+    var isInvalid: Bool { value == VersionSeed.invalid.value }
+
+    @inline(__always)
+    var isEmpty: Bool { value == VersionSeed.empty.value }
+
     @inline(__always)
-    func merge(_ seed: VersionSeed) -> VersionSeed {
-        if isValid, seed.value == .zero {
-            self
-        } else if value == .zero, seed.isValid {
-            seed
-        } else {
-            VersionSeed(value: merge32(value, seed.value))
+    mutating func merge(_ other: VersionSeed) {
+        guard !isInvalid, !other.isEmpty else {
+            return
         }
+        guard !isEmpty, !other.isInvalid else {
+            self = other
+            return
+        }
+        self = VersionSeed(value: merge32(value, other.value))
+    }
+
+    @inline(__always)
+    func merging(_ seed: VersionSeed) -> VersionSeed {
+        var newValue = self
+        newValue.merge(seed)
+        return newValue
     }
 }
 
@@ -57,11 +71,11 @@ struct VersionSeedTracker<Key: HostPreferenceKey> {
 
 struct VersionSeedSetTracker {
     private var values: [Value]
-    
+
     mutating func addPreference<Key: HostPreferenceKey>(_: Key.Type) {
         values.append(Value(key: _AnyPreferenceKey<Key>.self, seed: .invalid))
     }
-    
+
     mutating func updateSeeds(to preferences: PreferenceList) {
         for index in values.indices {
             var visitor = UpdateSeedVisitor(preferences: preferences, seed: nil)
@@ -86,17 +100,17 @@ extension VersionSeedSetTracker {
         let preferences: PreferenceList
         var seed: VersionSeed
         var matches: Bool?
-        
+
         mutating func visit(key: (some PreferenceKey).Type) {
             let valueSeed = preferences[key].seed
-            matches = seed.isValid && valueSeed.isValid && seed.value == valueSeed.value
+            matches = !seed.isInvalid && !valueSeed.isInvalid && seed.value == valueSeed.value
         }
     }
-    
+
     private struct UpdateSeedVisitor: PreferenceKeyVisitor {
         let preferences: PreferenceList
         var seed: VersionSeed?
-    
+
         mutating func visit(key: (some PreferenceKey).Type) {
             seed = preferences[key].seed
         }

Sources/OpenSwiftUI/Core/Render/DisplayList.swift

@@ -0,0 +1,13 @@
+// FIXME
+struct DisplayList {}
+
+// FIXME
+extension DisplayList {
+    struct Key: PreferenceKey {
+        static var defaultValue: Void = ()
+
+        static func reduce(value _: inout Void, nextValue _: () -> Void) {}
+
+        typealias Value = Void
+    }
+}

Sources/OpenSwiftUI/Core/View/TODO/_ViewInputs.swift

@@ -1,9 +1,11 @@
+internal import OpenGraphShims
+
 public struct _ViewInputs {
     var base: _GraphInputs
-//    var preferences : PreferencesInputs
-//    var transform : Attribute<ViewTransform>
-//    var position : Attribute<ViewOrigin>
-//    var containerPosition : Attribute<ViewOrigin>
-//    var size : Attribute<ViewSize>
-//    var safeAreaInsets : OptionalAttribute<SafeAreaInsets>
+    var preferences: PreferencesInputs
+    var transform: Attribute<ViewTransform>
+    var position: Attribute<ViewOrigin>
+    var containerPosition: Attribute<ViewOrigin>
+    var size: Attribute<ViewSize>
+    // var safeAreaInsets: OptionalAttribute<SafeAreaInsets>
 }

Sources/OpenSwiftUI/Core/View/TODO/_ViewOutputs.swift

@@ -1,4 +1,12 @@
+internal import OpenGraphShims
+
 public struct _ViewOutputs {
-//    var preferences : PreferencesOutputs
-//    var _layoutComputer : OptionalAttribute<LayoutComputer>
+    private var preferences = PreferencesOutputs()
+    @OptionalAttribute
+    var layoutComputer: LayoutComputer?
+    
+    subscript<Key: PreferenceKey>(_ keyType: Key.Type) -> Attribute<Key.Value>? {
+        get { preferences[keyType] }
+        set { preferences[keyType] = newValue }
+    }
 }

Sources/OpenSwiftUI/Core/View/ViewGraph.swift

@@ -41,6 +41,15 @@ final class ViewGraph: GraphHost {
     var mainUpdates: Int = 0
     var needsFocusUpdate: Bool = false
     var nextUpdate: (views: NextUpdate, gestures: NextUpdate) = (NextUpdate(time: .infinity), NextUpdate(time: .infinity))
+    private weak var _preferenceBridge: PreferenceBridge?
+    var preferenceBridge: PreferenceBridge? {
+        get { _preferenceBridge }
+        // FIXME: TO BE CONFIRMED
+        set { setPreferenceBridge(to: newValue, isInvalidating: newValue == nil) }
+    }
+    #if canImport(Darwin) // FIXME: See #39
+    var bridgedPreferences: [(AnyPreferenceKey.Type, OGAttribute)] = []
+    #endif
     // TODO
 
     init<Body: View>(rootViewType: Body.Type, requestedOutputs: Outputs) {
@@ -148,6 +157,14 @@ final class ViewGraph: GraphHost {
         return []
     }
 
+    func clearPreferenceBridge() {
+        setPreferenceBridge(to: nil, isInvalidating: true)
+    }
+    
+    private func setPreferenceBridge(to bridge: PreferenceBridge?, isInvalidating: Bool) {
+        // TODO
+    }
+    
     // MARK: - Override Methods
 
     override var graphDelegate: GraphDelegate? { delegate }
@@ -165,7 +182,7 @@ final class ViewGraph: GraphHost {
     }
 
     override func timeDidChange() {
-        // TODO
+        nextUpdate.views = NextUpdate(time: .infinity)
     }
 
     override func isHiddenForReuseDidChange() {
@@ -185,6 +202,20 @@ extension ViewGraph {
             _interval = .infinity
             reasons = []
         }
+        
+        // TODO: AnimatorState.nextUpdate
+        mutating func interval(_ value: Double, reason: UInt32?) {
+            if value == .zero {
+                if _interval > 1 / 60 {
+                    _interval = .infinity
+                }
+            } else {
+                _interval = min(value, _interval)
+            }
+            if let reason {
+                reasons.insert(reason)
+            }
+        }
     }
 }
 

Sources/OpenSwiftUI/Data/Preference/HostPreferenceKey.swift

@@ -7,8 +7,18 @@
 //  ID: 7429200566949B8FB892A77E01A988C8
 
 struct HostPreferencesKey: PreferenceKey {
-    private static var nodeId: UInt32 = .zero
+    static var defaultValue: PreferenceList {
+        PreferenceList()
+    }
 
+    static func reduce(value: inout PreferenceList, nextValue: () -> PreferenceList) {
+        value.merge(nextValue())
+    }
+}
+
+extension HostPreferencesKey {
+    private static var nodeId: UInt32 = .zero
+
     @inline(__always)
     static func makeNodeID() -> UInt32 {
         defer { nodeId &+= 1 }